Re: audio steganography - C# Discussion Boards

Jimmanuel18-Jun-07 3:42

Jimmanuel

18-Jun-07 3:42

MSDN[^]

A M SOMAN18-Jun-07 20:57

A M SOMAN

18-Jun-07 20:57

Thanks!

\laddie18-Jun-07 19:30

\laddie

18-Jun-07 19:30

Anil have a look at http://www.codeproject.com/office/excel_using_oledb.asp?df=100&forumid=115836&exp=0&select=1937086[^]

And

http://www.c-sharpcorner.com/UploadFile/mgold/Query2Excel12032005011029AM/Query2Excel.aspx[^]

A M SOMAN18-Jun-07 20:57

A M SOMAN

18-Jun-07 20:57

Thanks man! it was helpful.

audio steganography

nikhilvrm17-Jun-07 21:08

nikhilvrm

17-Jun-07 21:08

in what way should i write new file in .wav format to be played as a .wav music.currently data hiding is success but the file is not playing.

Christian Graus17-Jun-07 21:10

17-Jun-07 21:10

What have you done, and what do you hope to do ? Where is the data coming from that you hope will play as a wav ?

Christian Graus - Microsoft MVP - C++
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"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )

nikhilvrm17-Jun-07 21:20

nikhilvrm

17-Jun-07 21:20

i'm hiding a text file in wav file.problem in saving the file after hiding the text.sound is not playing

Colin Angus Mackay17-Jun-07 21:44

Colin Angus Mackay

17-Jun-07 21:44

nikhilvrm wrote:
i'm hiding a text file in wav file

You'll have to be more descriptive than that. How, exactly, are you hiding the text file. I mean, are you just writing out a text file but putting a wav file extension on it. I'd hope you were being more sophisticated than that. Are you ensuring the WAV header isn't being corrupted by your hiding process? Are you hiding the data in a way that is still compliant with the codec in which the audio information is encoded?

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Christian Graus17-Jun-07 22:09

17-Jun-07 22:09

OK - so you want to hide a text file, so the wav still plays ? Sounds like your core approach is broken and you need to better understand the wav file format, to learn how to hide data in there non destructively.

nikhilvrm17-Jun-07 22:33

nikhilvrm

17-Jun-07 22:33

i checked the header of newly created file.it is same as the original wave file.i'm writing the new file in bytes.its playing but no clarity in sound

Christian Graus17-Jun-07 22:43

17-Jun-07 22:43

Well, what did you expect, when you changed the sound file to have some text shoved in there ? I'd expect changing a wav to be much harder than hiding text in an image.

Add Items to a Listview in a fast way?

blackjack215017-Jun-07 22:16

blackjack2150

17-Jun-07 22:16

I think this will give you all the answers:
http://www.codeproject.com/csharp/steganodotnet8.asp[^]

Leia201117-Jun-07 21:07

Leia2011

17-Jun-07 21:07

Hey guys,

I need to add about 7000-14000 items to a listview.
But listing all the items is far too slow.
Do you have any idea how to make it faster?
thank you very much!

I use the following method:

private void trvLeft_AfterSelect(object sender, System.Windows.Forms.TreeViewEventArgs e)

{

DataRow[] rows = new DataRow [PnlSelect.pMCPTVARIABLEDESC .Rows.Count ];
System.Windows .Forms .ListView .ListViewItemCollection itlist= new System.Windows .Forms .ListView .ListViewItemCollection(lsvLeft);

try
{
lsvLeft.BeginUpdate ();
Cursor.Current =System.Windows .Forms .Cursors .WaitCursor;

//Clear old content:
lsvLeft.Clear ();//lsvLeft is my ListView
pTrvLeftTag=(TrvLeftTag)e.Node.Tag ;

rows=PnlSelect.pMCPTVARIABLEDESC .Select ("VARGROUPID='"+pTrvLeftTag.vargroup +"' AND CONNECTIONID='"+pTrvLeftTag.connection +"'");

foreach(DataRow row in rows)
{
itlist.Add(row["VARIABLENAME"].ToString ());
}

//add images
foreach( ListViewItem it in lsvLeft.Items )
{
it.ImageIndex =6;
}

}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message );
}
finally
{
lsvLeft.EndUpdate ();
Cursor.Current =System.Windows .Forms .Cursors .Default;
}
}

Christian Graus17-Jun-07 21:32

17-Jun-07 21:32

Leia2011 wrote:
I need to add about 7000-14000 items to a listview.

Well, that's not really a sensible UI. You probably need to show a filtered view. How is someone going to navigate these 10000 odd items ?

Dave Kreskowiak18-Jun-07 2:28

Dave Kreskowiak

18-Jun-07 2:28

7000-14000 items?? Why on earth would anyone want to go through that many items? I think you have a bit of a design flaw in your UI.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007

Leia201118-Jun-07 2:51

Leia2011

18-Jun-07 2:51

hi,

It is important to show all those items, it should not be a design flaw.
My Listview should contain all variables of a industrial plant.
the user should select about 10 variables from that listview and these 10 variables will be shown in an configurable protocol afterwards.
I reading my data out of an SQL-table which is filled by the Siemens visualization software WinCC.
The problem is that there are so many variables.

I have decided to use a listbox now. I doesn't look as good as a listview and has not that much option, but those 100000 items are there in a minute...
i do not have other ideas...

kind regards

Dave Kreskowiak18-Jun-07 15:44

Dave Kreskowiak

18-Jun-07 15:44

Leia2011 wrote:
it should not be a design flaw.

Actually, it IS a desgin flaw, on your part. Noone is going to go through a list of 14,000 items to pick 10 of them.

Redesgin you interface so the items are seperated into logical groups so the user can narrow down the list to just the items in a particular group.

If you put 14,000 items into a list view and expect someone to look through them all, I guarantee you the users will hunt you down and shove the installation CD where the sun don't shine.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007

PIEBALDconsult18-Jun-07 10:07

PIEBALDconsult

18-Jun-07 10:07

.AddRange() ?

But, yeah, that's a lot of stuff. Some sort of filter would be good.

girm21-Jun-07 6:45

girm

21-Jun-07 6:45

Hi,

I will not discuss if it is reasonable to display that much lines - you say you need it's ok for me.

I bump in a similar problem , I needed to add lines (trace lines) on a screen as fast as possible.
I made several experiment : listBox , listView, richTextBox , (even webBrowser ...)

It turns out that richTextbox was the fastest , and that the speed to add new line was constant , whatever was the numer of lines already added.

Of course in this case you shouldn't add lines one by ones , but all in one call.
Just set the rtb not to be editable.
Even handle the line selection by yourself.

And you will get a super fast , super basic ListBox Smile | :)

Hope it helps

want to use VC++ class in C#

Leia201125-Jun-07 21:02

Leia2011

25-Jun-07 21:02

Hi girm,

thanks for your answer,
yes, sometimes it is necessary to add as many lines as mentioned.
I think Listbox ist the best option to use in this case.

my code snippet:

this.ListBox1.DisplayMember ="column";
this.ListBox1.DataSource =dt;//dt: DataTable

regards

Leia2011

devesh_code17-Jun-07 20:26

devesh_code

17-Jun-07 20:26

Hello

I want to use some VC++ classes in C#... is it possible ???
If it is possible, then how ???

Thanks

Devesh Mishra

Re: want to use VC++ class in C#

Christian Graus17-Jun-07 21:12